xref: /freebsd/sys/netsmb/smb_conn.c (revision 87569f75a91f298c52a71823c04d41cf53c88889)
1  /*-
2   * Copyright (c) 2000-2001 Boris Popov
3   * All rights reserved.
4   *
5   * Redistribution and use in source and binary forms, with or without
6   * modification, are permitted provided that the following conditions
7   * are met:
8   * 1. Redistributions of source code must retain the above copyright
9   *    notice, this list of conditions and the following disclaimer.
10   * 2. Redistributions in binary form must reproduce the above copyright
11   *    notice, this list of conditions and the following disclaimer in the
12   *    documentation and/or other materials provided with the distribution.
13   * 3. All advertising materials mentioning features or use of this software
14   *    must display the following acknowledgement:
15   *    This product includes software developed by Boris Popov.
16   * 4. Neither the name of the author nor the names of any co-contributors
17   *    may be used to endorse or promote products derived from this software
18   *    without specific prior written permission.
19   *
20   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
21   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23   * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
24   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30   * SUCH DAMAGE.
31   */
32  
33  /*
34   * Connection engine.
35   */
36  
37  #include <sys/cdefs.h>
38  __FBSDID("$FreeBSD$");
39  
40  #include <sys/param.h>
41  #include <sys/systm.h>
42  #include <sys/kernel.h>
43  #include <sys/malloc.h>
44  #include <sys/proc.h>
45  #include <sys/lock.h>
46  #include <sys/sysctl.h>
47  #include <sys/socketvar.h>
48  
49  #include <sys/iconv.h>
50  
51  #include <netsmb/smb.h>
52  #include <netsmb/smb_subr.h>
53  #include <netsmb/smb_conn.h>
54  #include <netsmb/smb_tran.h>
55  #include <netsmb/smb_trantcp.h>
56  
57  static struct smb_connobj smb_vclist;
58  static int smb_vcnext = 1;	/* next unique id for VC */
59  
60  SYSCTL_NODE(_net, OID_AUTO, smb, CTLFLAG_RW, NULL, "SMB protocol");
61  
62  MALLOC_DEFINE(M_SMBCONN, "smb_conn", "SMB connection");
63  
64  static void smb_co_init(struct smb_connobj *cp, int level, char *objname,
65  	struct thread *td);
66  static void smb_co_done(struct smb_connobj *cp);
67  static int  smb_co_lockstatus(struct smb_connobj *cp, struct thread *td);
68  
69  static int  smb_vc_disconnect(struct smb_vc *vcp);
70  static void smb_vc_free(struct smb_connobj *cp);
71  static void smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred);
72  static smb_co_free_t smb_share_free;
73  static smb_co_gone_t smb_share_gone;
74  
75  static int  smb_sysctl_treedump(SYSCTL_HANDLER_ARGS);
76  
77  SYSCTL_PROC(_net_smb, OID_AUTO, treedump, CTLFLAG_RD | CTLTYPE_OPAQUE,
78  	    NULL, 0, smb_sysctl_treedump, "S,treedump", "Requester tree");
79  
80  int
81  smb_sm_init(void)
82  {
83  
84  	smb_co_init(&smb_vclist, SMBL_SM, "smbsm", curthread);
85  	smb_co_unlock(&smb_vclist, 0, curthread);
86  	return 0;
87  }
88  
89  int
90  smb_sm_done(void)
91  {
92  
93  	/* XXX: hold the mutex */
94  	if (smb_vclist.co_usecount > 1) {
95  		SMBERROR("%d connections still active\n", smb_vclist.co_usecount - 1);
96  		return EBUSY;
97  	}
98  	lockmgr(&smb_vclist.co_lock, LK_DRAIN, 0, curthread);
99  	smb_co_done(&smb_vclist);
100  	return 0;
101  }
102  
103  static int
104  smb_sm_lockvclist(int flags, struct thread *td)
105  {
106  
107  	return smb_co_lock(&smb_vclist, flags | LK_CANRECURSE, td);
108  }
109  
110  static void
111  smb_sm_unlockvclist(struct thread *td)
112  {
113  
114  	smb_co_unlock(&smb_vclist, LK_RELEASE, td);
115  }
116  
117  static int
118  smb_sm_lookupint(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
119  	struct smb_cred *scred,	struct smb_vc **vcpp)
120  {
121  	struct thread *td = scred->scr_td;
122  	struct smb_connobj *scp;
123  	struct smb_vc *vcp;
124  	int exact = 1;
125  	int error;
126  
127  	vcspec->shspec = shspec;
128  	error = ENOENT;
129  	vcp = NULL;
130  	SMBCO_FOREACH(scp, &smb_vclist) {
131  		vcp = (struct smb_vc *)scp;
132  		error = smb_vc_lock(vcp, LK_EXCLUSIVE, td);
133  		if (error)
134  			continue;
135  
136  		if ((vcp->obj.co_flags & SMBV_PRIVATE) ||
137  		    !CONNADDREQ(vcp->vc_paddr, vcspec->sap) ||
138  		    strcmp(vcp->vc_username, vcspec->username) != 0)
139  			goto err1;
140  		if (vcspec->owner != SMBM_ANY_OWNER) {
141  			if (vcp->vc_uid != vcspec->owner)
142  				goto err1;
143  		} else
144  			exact = 0;
145  		if (vcspec->group != SMBM_ANY_GROUP) {
146  			if (vcp->vc_grp != vcspec->group)
147  				goto err1;
148  		} else
149  			exact = 0;
150  		if (vcspec->mode & SMBM_EXACT) {
151  			if (!exact || (vcspec->mode & SMBM_MASK) !=
152  			    vcp->vc_mode)
153  				goto err1;
154  		}
155  		if (smb_vc_access(vcp, scred, vcspec->mode) != 0)
156  			goto err1;
157  		vcspec->ssp = NULL;
158  		if (shspec) {
159  			error = (int)smb_vc_lookupshare(vcp, shspec, scred,
160  			    &vcspec->ssp);
161  			if (error)
162  				goto fail;
163  		}
164  		error = 0;
165  		break;
166  	err1:
167  		error = 1;
168  	fail:
169  		smb_vc_unlock(vcp, 0, td);
170  	}
171  	if (vcp) {
172  		smb_vc_ref(vcp);
173  		*vcpp = vcp;
174  	}
175  	return (error);
176  }
177  
178  int
179  smb_sm_lookup(struct smb_vcspec *vcspec, struct smb_sharespec *shspec,
180  	struct smb_cred *scred,	struct smb_vc **vcpp)
181  {
182  	struct thread *td = scred->scr_td;
183  	struct smb_vc *vcp;
184  	struct smb_share *ssp = NULL;
185  	int error;
186  
187  	*vcpp = vcp = NULL;
188  
189  	error = smb_sm_lockvclist(LK_EXCLUSIVE, td);
190  	if (error)
191  		return error;
192  	error = smb_sm_lookupint(vcspec, shspec, scred, vcpp);
193  	if (error == 0 || (vcspec->flags & SMBV_CREATE) == 0) {
194  		smb_sm_unlockvclist(td);
195  		return error;
196  	}
197  	error = smb_sm_lookupint(vcspec, NULL, scred, &vcp);
198  	if (error) {
199  		error = smb_vc_create(vcspec, scred, &vcp);
200  		if (error)
201  			goto out;
202  		error = smb_vc_connect(vcp, scred);
203  		if (error)
204  			goto out;
205  	}
206  	if (shspec == NULL)
207  		goto out;
208  	error = smb_share_create(vcp, shspec, scred, &ssp);
209  	if (error)
210  		goto out;
211  	error = smb_smb_treeconnect(ssp, scred);
212  	if (error == 0)
213  		vcspec->ssp = ssp;
214  	else
215  		smb_share_put(ssp, scred);
216  out:
217  	smb_sm_unlockvclist(td);
218  	if (error == 0)
219  		*vcpp = vcp;
220  	else if (vcp)
221  		smb_vc_put(vcp, scred);
222  	return error;
223  }
224  
225  /*
226   * Common code for connection object
227   */
228  static void
229  smb_co_init(struct smb_connobj *cp, int level, char *objname, struct thread *td)
230  {
231  	SLIST_INIT(&cp->co_children);
232  	smb_sl_init(&cp->co_interlock, objname);
233  	lockinit(&cp->co_lock, PZERO, objname, 0, 0);
234  	cp->co_level = level;
235  	cp->co_usecount = 1;
236  	KASSERT(smb_co_lock(cp, LK_EXCLUSIVE, td) == 0, ("smb_co_init: lock failed"));
237  }
238  
239  static void
240  smb_co_done(struct smb_connobj *cp)
241  {
242  	smb_sl_destroy(&cp->co_interlock);
243  	lockmgr(&cp->co_lock, LK_RELEASE, 0, curthread);
244  	lockdestroy(&cp->co_lock);
245  }
246  
247  static void
248  smb_co_gone(struct smb_connobj *cp, struct smb_cred *scred)
249  {
250  	struct smb_connobj *parent;
251  
252  	if (cp->co_gone)
253  		cp->co_gone(cp, scred);
254  	parent = cp->co_parent;
255  	if (parent) {
256  		smb_co_lock(parent, LK_EXCLUSIVE, scred->scr_td);
257  		SLIST_REMOVE(&parent->co_children, cp, smb_connobj, co_next);
258  		smb_co_put(parent, scred);
259  	}
260  	if (cp->co_free)
261  		cp->co_free(cp);
262  }
263  
264  void
265  smb_co_ref(struct smb_connobj *cp)
266  {
267  
268  	SMB_CO_LOCK(cp);
269  	cp->co_usecount++;
270  	SMB_CO_UNLOCK(cp);
271  }
272  
273  void
274  smb_co_rele(struct smb_connobj *cp, struct smb_cred *scred)
275  {
276  	struct thread *td = scred->scr_td;
277  
278  	SMB_CO_LOCK(cp);
279  	if (cp->co_usecount > 1) {
280  		cp->co_usecount--;
281  		SMB_CO_UNLOCK(cp);
282  		return;
283  	}
284  	if (cp->co_usecount == 0) {
285  		SMBERROR("negative use_count for object %d", cp->co_level);
286  		SMB_CO_UNLOCK(cp);
287  		return;
288  	}
289  	cp->co_usecount--;
290  	cp->co_flags |= SMBO_GONE;
291  
292  	lockmgr(&cp->co_lock, LK_DRAIN | LK_INTERLOCK, &cp->co_interlock, td);
293  	smb_co_gone(cp, scred);
294  }
295  
296  int
297  smb_co_get(struct smb_connobj *cp, int flags, struct smb_cred *scred)
298  {
299  	int error;
300  
301  	if ((flags & LK_INTERLOCK) == 0)
302  		SMB_CO_LOCK(cp);
303  	cp->co_usecount++;
304  	error = smb_co_lock(cp, flags | LK_INTERLOCK, scred->scr_td);
305  	if (error) {
306  		SMB_CO_LOCK(cp);
307  		cp->co_usecount--;
308  		SMB_CO_UNLOCK(cp);
309  		return error;
310  	}
311  	return 0;
312  }
313  
314  void
315  smb_co_put(struct smb_connobj *cp, struct smb_cred *scred)
316  {
317  	struct thread *td = scred->scr_td;
318  
319  	SMB_CO_LOCK(cp);
320  	if (cp->co_usecount > 1) {
321  		cp->co_usecount--;
322  	} else if (cp->co_usecount == 1) {
323  		cp->co_usecount--;
324  		cp->co_flags |= SMBO_GONE;
325  	} else {
326  		SMBERROR("negative usecount");
327  	}
328  	lockmgr(&cp->co_lock, LK_RELEASE | LK_INTERLOCK, &cp->co_interlock, td);
329  	if ((cp->co_flags & SMBO_GONE) == 0)
330  		return;
331  	lockmgr(&cp->co_lock, LK_DRAIN, NULL, td);
332  	smb_co_gone(cp, scred);
333  }
334  
335  int
336  smb_co_lockstatus(struct smb_connobj *cp, struct thread *td)
337  {
338  	return lockstatus(&cp->co_lock, td);
339  }
340  
341  int
342  smb_co_lock(struct smb_connobj *cp, int flags, struct thread *td)
343  {
344  
345  	if (cp->co_flags & SMBO_GONE)
346  		return EINVAL;
347  	if ((flags & LK_TYPE_MASK) == 0)
348  		flags |= LK_EXCLUSIVE;
349  	if (smb_co_lockstatus(cp, td) == LK_EXCLUSIVE &&
350  	    (flags & LK_CANRECURSE) == 0) {
351  		SMBERROR("recursive lock for object %d\n", cp->co_level);
352  		return 0;
353  	}
354  	return lockmgr(&cp->co_lock, flags, &cp->co_interlock, td);
355  }
356  
357  void
358  smb_co_unlock(struct smb_connobj *cp, int flags, struct thread *td)
359  {
360  	(void)lockmgr(&cp->co_lock, flags | LK_RELEASE, &cp->co_interlock, td);
361  }
362  
363  static void
364  smb_co_addchild(struct smb_connobj *parent, struct smb_connobj *child)
365  {
366  	KASSERT(smb_co_lockstatus(parent, curthread) == LK_EXCLUSIVE, ("smb_co_addchild: parent not locked"));
367  	KASSERT(smb_co_lockstatus(child, curthread) == LK_EXCLUSIVE, ("smb_co_addchild: child not locked"));
368  
369  	smb_co_ref(parent);
370  	SLIST_INSERT_HEAD(&parent->co_children, child, co_next);
371  	child->co_parent = parent;
372  }
373  
374  /*
375   * Session implementation
376   */
377  
378  int
379  smb_vc_create(struct smb_vcspec *vcspec,
380  	struct smb_cred *scred, struct smb_vc **vcpp)
381  {
382  	struct smb_vc *vcp;
383  	struct thread *td = scred->scr_td;
384  	struct ucred *cred = scred->scr_cred;
385  	uid_t uid = vcspec->owner;
386  	gid_t gid = vcspec->group;
387  	uid_t realuid = cred->cr_uid;
388  	char *domain = vcspec->domain;
389  	int error, isroot;
390  
391  	isroot = smb_suser(cred) == 0;
392  	/*
393  	 * Only superuser can create VCs with different uid and gid
394  	 */
395  	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
396  		return EPERM;
397  	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
398  		return EPERM;
399  
400  	vcp = smb_zmalloc(sizeof(*vcp), M_SMBCONN, M_WAITOK);
401  	smb_co_init(VCTOCP(vcp), SMBL_VC, "smb_vc", td);
402  	vcp->obj.co_free = smb_vc_free;
403  	vcp->obj.co_gone = smb_vc_gone;
404  	vcp->vc_number = smb_vcnext++;
405  	vcp->vc_timo = SMB_DEFRQTIMO;
406  	vcp->vc_smbuid = SMB_UID_UNKNOWN;
407  	vcp->vc_mode = vcspec->rights & SMBM_MASK;
408  	vcp->obj.co_flags = vcspec->flags & (SMBV_PRIVATE | SMBV_SINGLESHARE);
409  	vcp->vc_tdesc = &smb_tran_nbtcp_desc;
410  	vcp->vc_seqno = 0;
411  	vcp->vc_mackey = NULL;
412  	vcp->vc_mackeylen = 0;
413  
414  	if (uid == SMBM_ANY_OWNER)
415  		uid = realuid;
416  	if (gid == SMBM_ANY_GROUP)
417  		gid = cred->cr_groups[0];
418  	vcp->vc_uid = uid;
419  	vcp->vc_grp = gid;
420  
421  	smb_sl_init(&vcp->vc_stlock, "vcstlock");
422  	error = ENOMEM;
423  
424  	vcp->vc_paddr = sodupsockaddr(vcspec->sap, M_WAITOK);
425  	if (vcp->vc_paddr == NULL)
426  		goto fail;
427  	vcp->vc_laddr = sodupsockaddr(vcspec->lap, M_WAITOK);
428  	if (vcp->vc_laddr == NULL)
429  		goto fail;
430  	vcp->vc_pass = smb_strdup(vcspec->pass);
431  	if (vcp->vc_pass == NULL)
432  		goto fail;
433  	vcp->vc_domain = smb_strdup((domain && domain[0]) ? domain :
434  	    "NODOMAIN");
435  	if (vcp->vc_domain == NULL)
436  		goto fail;
437  	vcp->vc_srvname = smb_strdup(vcspec->srvname);
438  	if (vcp->vc_srvname == NULL)
439  		goto fail;
440  	vcp->vc_username = smb_strdup(vcspec->username);
441  	if (vcp->vc_username == NULL)
442  		goto fail;
443  	error = (int)iconv_open("tolower", vcspec->localcs, &vcp->vc_tolower);
444  	if (error)
445  		goto fail;
446  	error = (int)iconv_open("toupper", vcspec->localcs, &vcp->vc_toupper);
447  	if (error)
448  		goto fail;
449  	if (vcspec->servercs[0]) {
450  		error = (int)iconv_open(vcspec->servercs, vcspec->localcs,
451  		    &vcp->vc_toserver);
452  		if (error)
453  			goto fail;
454  		error = (int)iconv_open(vcspec->localcs, vcspec->servercs,
455  		    &vcp->vc_tolocal);
456  		if (error)
457  			goto fail;
458  	}
459  	error = (int)smb_iod_create(vcp);
460  	if (error)
461  		goto fail;
462  	*vcpp = vcp;
463  	smb_co_addchild(&smb_vclist, VCTOCP(vcp));
464  	return (0);
465  
466   fail:
467  	smb_vc_put(vcp, scred);
468  	return (error);
469  }
470  
471  static void
472  smb_vc_free(struct smb_connobj *cp)
473  {
474  	struct smb_vc *vcp = CPTOVC(cp);
475  
476  	if (vcp->vc_iod)
477  		smb_iod_destroy(vcp->vc_iod);
478  	SMB_STRFREE(vcp->vc_username);
479  	SMB_STRFREE(vcp->vc_srvname);
480  	SMB_STRFREE(vcp->vc_pass);
481  	SMB_STRFREE(vcp->vc_domain);
482  	if (vcp->vc_mackey)
483  		free(vcp->vc_mackey, M_SMBTEMP);
484  	if (vcp->vc_paddr)
485  		free(vcp->vc_paddr, M_SONAME);
486  	if (vcp->vc_laddr)
487  		free(vcp->vc_laddr, M_SONAME);
488  	if (vcp->vc_tolower)
489  		iconv_close(vcp->vc_tolower);
490  	if (vcp->vc_toupper)
491  		iconv_close(vcp->vc_toupper);
492  	if (vcp->vc_tolocal)
493  		iconv_close(vcp->vc_tolocal);
494  	if (vcp->vc_toserver)
495  		iconv_close(vcp->vc_toserver);
496  	smb_co_done(VCTOCP(vcp));
497  	smb_sl_destroy(&vcp->vc_stlock);
498  	free(vcp, M_SMBCONN);
499  }
500  
501  /*
502   * Called when use count of VC dropped to zero.
503   * VC should be locked on enter with LK_DRAIN.
504   */
505  static void
506  smb_vc_gone(struct smb_connobj *cp, struct smb_cred *scred)
507  {
508  	struct smb_vc *vcp = CPTOVC(cp);
509  
510  	smb_vc_disconnect(vcp);
511  }
512  
513  void
514  smb_vc_ref(struct smb_vc *vcp)
515  {
516  	smb_co_ref(VCTOCP(vcp));
517  }
518  
519  void
520  smb_vc_rele(struct smb_vc *vcp, struct smb_cred *scred)
521  {
522  	smb_co_rele(VCTOCP(vcp), scred);
523  }
524  
525  int
526  smb_vc_get(struct smb_vc *vcp, int flags, struct smb_cred *scred)
527  {
528  	return smb_co_get(VCTOCP(vcp), flags, scred);
529  }
530  
531  void
532  smb_vc_put(struct smb_vc *vcp, struct smb_cred *scred)
533  {
534  	smb_co_put(VCTOCP(vcp), scred);
535  }
536  
537  int
538  smb_vc_lock(struct smb_vc *vcp, int flags, struct thread *td)
539  {
540  	return smb_co_lock(VCTOCP(vcp), flags, td);
541  }
542  
543  void
544  smb_vc_unlock(struct smb_vc *vcp, int flags, struct thread *td)
545  {
546  	smb_co_unlock(VCTOCP(vcp), flags, td);
547  }
548  
549  int
550  smb_vc_access(struct smb_vc *vcp, struct smb_cred *scred, mode_t mode)
551  {
552  	struct ucred *cred = scred->scr_cred;
553  
554  	if (smb_suser(cred) == 0 || cred->cr_uid == vcp->vc_uid)
555  		return 0;
556  	mode >>= 3;
557  	if (!groupmember(vcp->vc_grp, cred))
558  		mode >>= 3;
559  	return (vcp->vc_mode & mode) == mode ? 0 : EACCES;
560  }
561  
562  static int
563  smb_vc_cmpshare(struct smb_share *ssp, struct smb_sharespec *dp)
564  {
565  	int exact = 1;
566  
567  	if (strcmp(ssp->ss_name, dp->name) != 0)
568  		return 1;
569  	if (dp->owner != SMBM_ANY_OWNER) {
570  		if (ssp->ss_uid != dp->owner)
571  			return 1;
572  	} else
573  		exact = 0;
574  	if (dp->group != SMBM_ANY_GROUP) {
575  		if (ssp->ss_grp != dp->group)
576  			return 1;
577  	} else
578  		exact = 0;
579  
580  	if (dp->mode & SMBM_EXACT) {
581  		if (!exact)
582  			return 1;
583  		return (dp->mode & SMBM_MASK) == ssp->ss_mode ? 0 : 1;
584  	}
585  	if (smb_share_access(ssp, dp->scred, dp->mode) != 0)
586  		return 1;
587  	return 0;
588  }
589  
590  /*
591   * Lookup share in the given VC. Share referenced and locked on return.
592   * VC expected to be locked on entry and will be left locked on exit.
593   */
594  int
595  smb_vc_lookupshare(struct smb_vc *vcp, struct smb_sharespec *dp,
596  	struct smb_cred *scred,	struct smb_share **sspp)
597  {
598  	struct thread *td = scred->scr_td;
599  	struct smb_connobj *scp = NULL;
600  	struct smb_share *ssp = NULL;
601  	int error;
602  
603  	*sspp = NULL;
604  	dp->scred = scred;
605  	SMBCO_FOREACH(scp, VCTOCP(vcp)) {
606  		ssp = (struct smb_share *)scp;
607  		error = smb_share_lock(ssp, LK_EXCLUSIVE, td);
608  		if (error)
609  			continue;
610  		if (smb_vc_cmpshare(ssp, dp) == 0)
611  			break;
612  		smb_share_unlock(ssp, 0, td);
613  	}
614  	if (ssp) {
615  		smb_share_ref(ssp);
616  		*sspp = ssp;
617  		error = 0;
618  	} else
619  		error = ENOENT;
620  	return error;
621  }
622  
623  int
624  smb_vc_connect(struct smb_vc *vcp, struct smb_cred *scred)
625  {
626  
627  	return smb_iod_request(vcp->vc_iod, SMBIOD_EV_CONNECT | SMBIOD_EV_SYNC, NULL);
628  }
629  
630  /*
631   * Destroy VC to server, invalidate shares linked with it.
632   * Transport should be locked on entry.
633   */
634  int
635  smb_vc_disconnect(struct smb_vc *vcp)
636  {
637  
638  	smb_iod_request(vcp->vc_iod, SMBIOD_EV_DISCONNECT | SMBIOD_EV_SYNC, NULL);
639  	return 0;
640  }
641  
642  static char smb_emptypass[] = "";
643  
644  const char *
645  smb_vc_getpass(struct smb_vc *vcp)
646  {
647  	if (vcp->vc_pass)
648  		return vcp->vc_pass;
649  	return smb_emptypass;
650  }
651  
652  static int
653  smb_vc_getinfo(struct smb_vc *vcp, struct smb_vc_info *vip)
654  {
655  	bzero(vip, sizeof(struct smb_vc_info));
656  	vip->itype = SMB_INFO_VC;
657  	vip->usecount = vcp->obj.co_usecount;
658  	vip->uid = vcp->vc_uid;
659  	vip->gid = vcp->vc_grp;
660  	vip->mode = vcp->vc_mode;
661  	vip->flags = vcp->obj.co_flags;
662  	vip->sopt = vcp->vc_sopt;
663  	vip->iodstate = vcp->vc_iod->iod_state;
664  	bzero(&vip->sopt.sv_skey, sizeof(vip->sopt.sv_skey));
665  	snprintf(vip->srvname, sizeof(vip->srvname), "%s", vcp->vc_srvname);
666  	snprintf(vip->vcname, sizeof(vip->vcname), "%s", vcp->vc_username);
667  	return 0;
668  }
669  
670  u_short
671  smb_vc_nextmid(struct smb_vc *vcp)
672  {
673  	u_short r;
674  
675  	SMB_CO_LOCK(&vcp->obj);
676  	r = vcp->vc_mid++;
677  	SMB_CO_UNLOCK(&vcp->obj);
678  	return r;
679  }
680  
681  /*
682   * Share implementation
683   */
684  /*
685   * Allocate share structure and attach it to the given VC
686   * Connection expected to be locked on entry. Share will be returned
687   * in locked state.
688   */
689  int
690  smb_share_create(struct smb_vc *vcp, struct smb_sharespec *shspec,
691  	struct smb_cred *scred, struct smb_share **sspp)
692  {
693  	struct smb_share *ssp;
694  	struct thread *td = scred->scr_td;
695  	struct ucred *cred = scred->scr_cred;
696  	uid_t realuid = cred->cr_uid;
697  	uid_t uid = shspec->owner;
698  	gid_t gid = shspec->group;
699  	int error, isroot;
700  
701  	isroot = smb_suser(cred) == 0;
702  	/*
703  	 * Only superuser can create shares with different uid and gid
704  	 */
705  	if (uid != SMBM_ANY_OWNER && uid != realuid && !isroot)
706  		return EPERM;
707  	if (gid != SMBM_ANY_GROUP && !groupmember(gid, cred) && !isroot)
708  		return EPERM;
709  	error = smb_vc_lookupshare(vcp, shspec, scred, &ssp);
710  	if (!error) {
711  		smb_share_put(ssp, scred);
712  		return EEXIST;
713  	}
714  	if (uid == SMBM_ANY_OWNER)
715  		uid = realuid;
716  	if (gid == SMBM_ANY_GROUP)
717  		gid = cred->cr_groups[0];
718  	ssp = smb_zmalloc(sizeof(*ssp), M_SMBCONN, M_WAITOK);
719  	smb_co_init(SSTOCP(ssp), SMBL_SHARE, "smbss", td);
720  	ssp->obj.co_free = smb_share_free;
721  	ssp->obj.co_gone = smb_share_gone;
722  	smb_sl_init(&ssp->ss_stlock, "ssstlock");
723  	ssp->ss_name = smb_strdup(shspec->name);
724  	if (shspec->pass && shspec->pass[0])
725  		ssp->ss_pass = smb_strdup(shspec->pass);
726  	ssp->ss_type = shspec->stype;
727  	ssp->ss_tid = SMB_TID_UNKNOWN;
728  	ssp->ss_uid = uid;
729  	ssp->ss_grp = gid;
730  	ssp->ss_mode = shspec->rights & SMBM_MASK;
731  	smb_co_addchild(VCTOCP(vcp), SSTOCP(ssp));
732  	*sspp = ssp;
733  	return 0;
734  }
735  
736  static void
737  smb_share_free(struct smb_connobj *cp)
738  {
739  	struct smb_share *ssp = CPTOSS(cp);
740  
741  	SMB_STRFREE(ssp->ss_name);
742  	SMB_STRFREE(ssp->ss_pass);
743  	smb_sl_destroy(&ssp->ss_stlock);
744  	smb_co_done(SSTOCP(ssp));
745  	free(ssp, M_SMBCONN);
746  }
747  
748  static void
749  smb_share_gone(struct smb_connobj *cp, struct smb_cred *scred)
750  {
751  	struct smb_share *ssp = CPTOSS(cp);
752  
753  	smb_smb_treedisconnect(ssp, scred);
754  }
755  
756  void
757  smb_share_ref(struct smb_share *ssp)
758  {
759  	smb_co_ref(SSTOCP(ssp));
760  }
761  
762  void
763  smb_share_rele(struct smb_share *ssp, struct smb_cred *scred)
764  {
765  	smb_co_rele(SSTOCP(ssp), scred);
766  }
767  
768  int
769  smb_share_get(struct smb_share *ssp, int flags, struct smb_cred *scred)
770  {
771  	return smb_co_get(SSTOCP(ssp), flags, scred);
772  }
773  
774  void
775  smb_share_put(struct smb_share *ssp, struct smb_cred *scred)
776  {
777  	smb_co_put(SSTOCP(ssp), scred);
778  }
779  
780  int
781  smb_share_lock(struct smb_share *ssp, int flags, struct thread *td)
782  {
783  	return smb_co_lock(SSTOCP(ssp), flags, td);
784  }
785  
786  void
787  smb_share_unlock(struct smb_share *ssp, int flags, struct thread *td)
788  {
789  	smb_co_unlock(SSTOCP(ssp), flags, td);
790  }
791  
792  int
793  smb_share_access(struct smb_share *ssp, struct smb_cred *scred, mode_t mode)
794  {
795  	struct ucred *cred = scred->scr_cred;
796  
797  	if (smb_suser(cred) == 0 || cred->cr_uid == ssp->ss_uid)
798  		return 0;
799  	mode >>= 3;
800  	if (!groupmember(ssp->ss_grp, cred))
801  		mode >>= 3;
802  	return (ssp->ss_mode & mode) == mode ? 0 : EACCES;
803  }
804  
805  void
806  smb_share_invalidate(struct smb_share *ssp)
807  {
808  	ssp->ss_tid = SMB_TID_UNKNOWN;
809  }
810  
811  int
812  smb_share_valid(struct smb_share *ssp)
813  {
814  	return ssp->ss_tid != SMB_TID_UNKNOWN &&
815  	    ssp->ss_vcgenid == SSTOVC(ssp)->vc_genid;
816  }
817  
818  const char*
819  smb_share_getpass(struct smb_share *ssp)
820  {
821  	struct smb_vc *vcp;
822  
823  	if (ssp->ss_pass)
824  		return ssp->ss_pass;
825  	vcp = SSTOVC(ssp);
826  	if (vcp->vc_pass)
827  		return vcp->vc_pass;
828  	return smb_emptypass;
829  }
830  
831  static int
832  smb_share_getinfo(struct smb_share *ssp, struct smb_share_info *sip)
833  {
834  	bzero(sip, sizeof(struct smb_share_info));
835  	sip->itype = SMB_INFO_SHARE;
836  	sip->usecount = ssp->obj.co_usecount;
837  	sip->tid  = ssp->ss_tid;
838  	sip->type= ssp->ss_type;
839  	sip->uid = ssp->ss_uid;
840  	sip->gid = ssp->ss_grp;
841  	sip->mode= ssp->ss_mode;
842  	sip->flags = ssp->obj.co_flags;
843  	snprintf(sip->sname, sizeof(sip->sname), "%s", ssp->ss_name);
844  	return 0;
845  }
846  
847  /*
848   * Dump an entire tree into sysctl call
849   */
850  static int
851  smb_sysctl_treedump(SYSCTL_HANDLER_ARGS)
852  {
853  	struct thread *td = req->td;
854  	struct smb_cred scred;
855  	struct smb_connobj *scp1, *scp2;
856  	struct smb_vc *vcp;
857  	struct smb_share *ssp;
858  	struct smb_vc_info vci;
859  	struct smb_share_info ssi;
860  	int error, itype;
861  
862  	smb_makescred(&scred, td, td->td_ucred);
863  	error = sysctl_wire_old_buffer(req, 0);
864  	if (error)
865  		return (error);
866  	error = smb_sm_lockvclist(LK_SHARED, td);
867  	if (error)
868  		return error;
869  	SMBCO_FOREACH(scp1, &smb_vclist) {
870  		vcp = (struct smb_vc *)scp1;
871  		error = smb_vc_lock(vcp, LK_SHARED, td);
872  		if (error)
873  			continue;
874  		smb_vc_getinfo(vcp, &vci);
875  		error = SYSCTL_OUT(req, &vci, sizeof(struct smb_vc_info));
876  		if (error) {
877  			smb_vc_unlock(vcp, 0, td);
878  			break;
879  		}
880  		SMBCO_FOREACH(scp2, VCTOCP(vcp)) {
881  			ssp = (struct smb_share *)scp2;
882  			error = smb_share_lock(ssp, LK_SHARED, td);
883  			if (error) {
884  				error = 0;
885  				continue;
886  			}
887  			smb_share_getinfo(ssp, &ssi);
888  			smb_share_unlock(ssp, 0, td);
889  			error = SYSCTL_OUT(req, &ssi, sizeof(struct smb_share_info));
890  			if (error)
891  				break;
892  		}
893  		smb_vc_unlock(vcp, 0, td);
894  		if (error)
895  			break;
896  	}
897  	if (!error) {
898  		itype = SMB_INFO_NONE;
899  		error = SYSCTL_OUT(req, &itype, sizeof(itype));
900  	}
901  	smb_sm_unlockvclist(td);
902  	return error;
903  }
904